#include <iostream>

int main(int argc, char const *argv[])
{
    int a = 1;
    int b = 2;
    auto exp = a <=> b;
    if (exp > 0)
    {
        std::cout << " a大" << std::endl;
    }
    else if (exp < 0)
    {
        std::cout << " b大" << std::endl;
    }
    else
    {
        std::cout << " 相等" << std::endl;
    }
    return 0;
}
